Drive for machine-tools.



PATENTED sEPT.ze,19'o5.

Gr. E. STEVENS. DRIVE IOR MACHINE TOOLS.

APPLICATION FILED MAEJO, 1904.

V-. .1. A Y

E.. InOerwtor George teer'ws (Dit/messes GEORGE s'rEvENs,

u UNITED .STATES .aimerais` COMPANY.

PATENT marion.

OFLYNN, MAssAcHusErrs. yAssicrivoa To GENERAL A ooaroRA'rIoNoF NewYoan.V

brave Fon MAo'HiNE-TQOLS.

To all, whom/ it pmj/ concern- Be it known thatI, rEoRGaI-E. S'ravnssa.

citizen of the United States, residing at Lynn,

'driving such tools.

county of Essex, State of Massachusetts, haveA invented 'certai nnew anduseful Improvements in Drives for Machine-Tools, of which thetollowing-'is a specification.

j The present invention relates to machine-l chi ne-tools which may bereadily actuated into and out of operative' relation therewith and thespeed at which-the machine-tool is driven varied at the will of theoperator without the use of current controllingy and regulating In theaccompanying drawings', which ,form a part of this specification, I haveshown one sensitive drill-press. Y

Figure lis a broken side elevation with the several parts in operativerelation. Fig.- 2 is atop plan. Fig. 3 is-a broken frontelevation of thefriction-disks and their-supports, drawn to a larger scaleand Fig. 4 isa front sectional 'elevation'of themotorv and its sup'- port, taken online 4 4 of Fig. 1. v

A is the main column of the drill-press, provided with parallelguideways upon which a \ferticaily-adjustable bearing B for thedrillshaft C is secured and has mounted thereon a platen I) and a fixedbracket E in which the upper part of :the drill-shaft C is journaled.-

r embodiment of my invention as applied to a The upper end of the columnis extended rearported by the fixed disk 4 is supported in'its plane o'fwardly, forming a bracket F, whiclris provided with lugs 1, carrying ahinge-shaft 2,` upon which a motor 3 is. pivoted. The drillv shaft C islongitudinally slotted for 'sliding engagement with afriction drivedisk4, which rotates in a stationary circular shell 5, supbracket El'rotation by a thrust-roller 6, wlliclris'journaledin a lug 7 on theupper'side of theiixedlarm The motor 3 has its lugs 8, bywhichitispivotally mounted on tire hinge-shaft 2, located' at its rear end andin theplane of its base, so thatr v its center of gravity-fallsbe-tween'the hinge-` Ishaft 2 and the drill-shaft C. The shaft- 9 of themotor isextended forwardand journaled at its end in an overhangingbracket 10, and a frlctlon-disk l11 to'fcoperate`withthe /drive-Speciation of' Letters Patent. Application mea Maron 1o, 1904. 'serialNo. 197,476.'V

lment of the latch Ispending notch 17.

The drive-- Patented set. v26. 1905.'

disk 4 is featheredl thereto, so as to transmit thepmotion of the shaft9to the drive-disk 4 -in whatever position thc-roll may be placedthereon.

The means forchanging the position ofthe friction-disk 11 .relatively tothe axis of rotation of the drill-shaft C. to thereby vary the speed ofrotation of the latter,'consists of a yoke-piece 12, Surrounding' thehub of the disk at its inner end andflongitudinally movable at its outerend on a guide-rod 13, projecting tromthe motor-frame parallel to theshaft 9 and to the middle of which a latchlever 14 is pivoted. Thelatch-lever -14 is provided at its free end with a'handle 15 and at oneside near its pivoted end with a' latch projection 16, which isfadaptedto take into" a series ofvnotches 17 in the'guid-rod 13 The free end ofthe latch-lever 14-is carried 4in a guide-box 18, fixed to the forwardend of the guide-rod 13, and is normally pressed toward the'rod 13'withits latch in engagement with-a notch 17. by means. of'a rollerY19,located in the guide-box 18 and havingthe opposite'fends of its shaft20 engaged by helicalsprings 21,l so lthat when -the` positionv of thedisk 11,is to be changed the free`end of the llatch-lever 14 is movedagainst the tension of the springs21 untilfthe Ilatch projection 16 isremoved from its notch, and'then by a `push ora pull upon the lever 14,according as it is desired nto decrease'or incrcasethe speed of 4`thedrill, the friction -disk 11 is moved to aposition farther from o'rnearer `to the'axis of rotation of vthe drill-shaft and loekedin itsadjusted position bythe engage- By pivoting the ,motor in a plane beyondavailable to press the friction drive members 11 and 4 into workingengagement, and in rder tovary-the pressure exerted by the weight ofthemotor-upon the ,drive members a leaf-spring 22, adapted to exert acounterbalancing pressure upon the motor, israrrangedvbetween theundersideof the motr "9e projection 16 with a corre- I OO and -the top of the`column A and connected to the latter by a serew`23.` The means forydisconnecting the driving member 11 from' the driven member to thereby...'re'st'ifthe drill-shaft-/C without' stopping themotor consists of al'ever.24, pivoted to'one 'side, of 'the bracket F in suchposition thatits short arm may engage av shoulder orsurface of the motor and tilt thelatter upward when the lever is actuated from the full-line position tthedotted positionin Fig. l.

IV do not desireto restrict myself vto`V` the particular form orconstruction of parts herein described and shown, since it is apparentthat they may be changed and modified without departing from myinvention. 4

What 1 clalm as new, anddesire to secure by LettersA Patent of theUnited States, is

1. The combination in a machine-tool, of a l vertical shaft, afriction-disk connected thereto, a.,pivotally-supported motor having itsshaft arranged at an angle to the first shaft and provided with afriction-disk adapted to rest upon the side of the first friction-disk,and means for tilting said motor-'to engage and disengage saidfriction-disks.

pivoted upon a stationary part and adapted to engage said motor to tiltit. and disengage 'said friction-disks. t

3. In a machine-tool, the combination of a drive-shaft, a driven shaft,cooperating friction-disks connected to said shafts, and means foradjusting the position of one of said disks relativelyto the othercomprising a yokepiece, a notched guide-rod and a springpressed latchconnected to said yoke-piece and engaging the notches of said guide-rod.

4. In a machine-tooLthe combination of a drive-shaft, a driven shaft,coperating friction-disks connected to said shafts, and means foradjusting the position of one of said disksv relativbely ,to the othercomprising a yokepiece in engagement at one end with the friction-disk,a notched guide-rod in engagement with the other` end of said yoke-pieceand arranged parallel to the axis of said disk, a guide-block secured tosaid guide-rod, a latchlever pivotally connected to said yoke-piece andadapted to engage said notches and a spring carried by said guide-blockand oper- -ating to force said lever into locked position.

In witness -whereof 1 have hereunto set my y handthis 8th day of'March,1904.

GEORGE STEVENS.

